1. Ugelstad Laboratory, Department of Chemical Engineering, Norwegian University of Science and Technology, N-7491 Trondheim, Norway, SINTEF Materials and Chemistry, N-7465 Trondheim, Norway, Matforsk AS, Norwegian Food Research Institute, Osloveien 1, N-1430 Ås, Norway, The Norwegian Paper and Fibre Research Institute, Høgskoleringen 6b, N-7491 Trondheim, Norway, and Laboratory of Forest Products Chemistry, Helsinki University of Technology, Post Office Box 6300, 02015 TKK, Finland